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Piemontite : ウィキペディア英語版
Piemontite

Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH).〔 It is a member of the epidote group.〔(Mindat reference page for Piemontite )〕
Red to reddish-brown or red-black in colour, Piemontite has a red streak and a vitreous lustre.〔
The type locality is the Prabornaz Mine, in Saint-Marcel, Aosta Valley, Italy.〔
It occurs metamorphic rocks of the greenschist to amphibolite metamorphic facies and in low-temperature hydrothermal veins in altered volcanic rocks. It also occurs in metasomatized deposits of manganese ore. Associated minerals include: epidote, tremolite, glaucophane, orthoclase, quartz and calcite.〔
==References==




抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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